For the most part, the Changchun Friends website is not very active and has been superseded by the Tencent "Wechat" app by the local expat community. This website is maintained sporadically, people may still join and membership is still open, but if you are a spammer, stay away. The archived information here is still useful, but some may be out of date. There are plans to make it more useful for static information in the future. If anyone needs information about Changchun or China, you may post a message and it probably will get a response but not immediately.
If you have an invitation, click the link in the email to join. Or, why not create your own group?